Code Runner vs Hmr

In-depth architectural comparison of the Code Runner and Hmr MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Code Runner when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Code Runner Details

Choose Hmr when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Hmr Details

Feature & Specification Comparison

Specification	Code Runner Developer Tools	Hmr Developer Tools
Summary	Code Runner MCP Server which can run code in various programming languages.	Hot Module Reload (HMR) and reactive programming for Python
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "code-runner": {
      "command": "npx",
      "args": [
        "-y",
        "for"
      ]
    }
  }
}

{
  "mcpServers": {
    "hmr-2": {
      "command": "uvx",
      "args": [
        "hmr"
      ]
    }
  }
}

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